Driver for socketed screws



original Fi 11111111111 59 mlm-mmm a Patented .l n, A Y

A 2,369,852Av A naiven Fon socxn'rnn scmsws William A.' Purtell, West' Hartford, Conn., assignor to The Holo-Krome vScrew corporation of Connecticut Corporation, a

original applicati@ Mey- 26, 1939, serial No. 275,902. Divided and this application March 2, 1942. serial No. V433,031

1 Claim. Cl.l 145-50) My invention relates to drivers for socketedv screws.

It has among its objects to provide an improved driver for a socketed screw of the construction described and claimed in my copending application, Serial No. 275,902, filed May 26, 5 centutes intersecting along a line l which, as 1939, now Patent No. 2,285,460, of which this apappears in Fig. 4, is convex. The intersection plication is a division. A further object is to line 'l forms angles with the vertical axis of the provide such an improved driver whereby it is socket which become progressively more acute made possible to connect the screw and driver toward and to the bottom of the socket.

readily by simply bringing the same together Cooperating with the socket 2 is the turning longitudinally, in such manner as to prevent member or driver 3. This member has a bit poraccidental loss of the screw, and While facilition recessed by indentations at a plurality of l tating driving of the screw and the insertion of peripheral points to provide binding surfaces of the driver and enabling the driver to be readily substantial lateral area cooperating with those withdrawn when desired. Other objects include of the socket. The bit has lateral abutments in the provision of an improved combination of the form of rib portions 8 having end surfaces El such a socketed screw and its cooperating driver. which, as shown in Fig. 2, are concave and form Other objects and advantages of my improveangles becoming progressively more acute toward ments willv hereinafter appear. and to the lower end of the bit. The rib portions In the accompanying drawing, I have shown have side surfaces l0 which, as shown in Fig. 7. for purposes of illustration certain embodiments are slightly convex. These side surfaces inter- Which my invention may assume in practice. sect along lines il corresponding to the inter- In this drawing: section lines l. When the bit is in engaged posi- Figure l is a side elevation of the driver in tion, it does not extend completely to the botprocess of being inserted in the screw socket, tom of the socket, there being a space provided the screw being shown in section to facilitate between the lower end of the bit and the floor illustration; of the socket, due to the fact that the area of the Fig. 2 iS a vertical Setion 0n line 2-2 0f Figbottom o1 the bit is larger than the area of the ure 3 showing the driver in operative position 3U floor of the socket. in the screw socket; In practice, the driver may be produced by Fig. 3 is a transverse section on line 3-3 of cutting ofi'. the extremity of the punch used in Figure 2; forming the socket 2. When so cut off, the punch Fig. 4 is a vertical section on line 4-4 of Figis converted into a driver having the desired ure 3; 35 binding effect.

Fig. 5 is a transverse section on line 5-5 of In Figure 6, I have shown a modied vform of Figure 1; driver which may be used if desired.. In this con- 1Fig. 6 is a view similar to Figure 2 showing a struction, the driver is of the same construction modified construction; and as that heretofore described, save that, instead Fig. '7 is a transverse section on line l-l of 40 of the end walls 9 on the ribs being adapted to Fig. 6. engage the end walls 5 of the flutes 4 through- In the illustrative construction shown in Figout their length, the end walls 9 in the mouth ures 1 to 5, inclusive, I have shown a screw head of the socket are cut back or slabbed ol at their I having therein a turning socket, generally inupper or outer ends, as shown at i3 to provide a dicated at 2, of the construction described and space I4 between the walls 5 and 9. It is unclaimed in said application, with an improved derstood that, in this form, the surfaces of subturning member or driver 3 likewise of the constantial lateral area, provided on the bit are of struction illustrated therein and adapted to be a lateral dimension such that the binding surreceived in this socket 2 and cooperating therefaces on the bit are spa-ced downwardly from with in an improved manner, as hereinafter dethe top of the socket as well as upwardly from. scribed. the bottom of the socket.

Referring to the socket 2, it will be seenthat While I have in this application specifically it is provided with a series of radially disposed described certain forms which my invention may flutes 4. Each of these has an end surface 5a assume ln practice, it will be understood that which, as appears in Fig. 2, is convex, the verthese forms of the same have been shown for tical angle of the surface with respect to the axis of the socket becoming progressively more acute toward 'and to the bottom of the socket. Each flute is also provided with laterally concave side surfaces 6, the adjacent side surfaces of adjaaxis of the driver which become more acute progressively toward and to the lower end of the bit, the extreme lower end of said bit having an area larger than that of the floor of the socket and said abutments being cut back for a predetermined distance in the zone located in the entrance to the mouth of the socket so as to limit the binding of said outer surfaces of the abutments with corresponding parts in the socket to a region spaced upwardly from the bottom of the socket and downwardly from the top of the socket.

WILLIAM A. PURTELL. 

